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UCC5310: IOL spec

Yasushi Fujiwara
Genius 12725 points
Part Number: UCC5310

Hi Experts,

My customer would like to use UCC5310MCDR for IGBT gate driver. Customer mentioned that IOL will be over 1.1A (around 1.5A). Is it violate IOL spec?
[condition]
- gate voltage: 15V
- Gate resistor: 10ohm
- switching frequency: 20KHz
- Qg: 0.8uC

If UCC5310MCDR does not fit for customer use case, would you tell your recommended devices?

Best Regards,
Fujiwara

  • 0
    TI__Expert 3355 points

    Hi Fujiwara,

    Thank you for your question. I work on the applications team in the high power drivers group.

    This will not violate the IOL spec. Our devices use a MOSFET based pull-up and pull-down structure, with varying drive strength. The IOL spec is there to convey drive strength, not necessarily the maximum current limit that causes damage. This drive structure limits the current based on the Vds vs Id curve of our internal MOSFETs. UCC5310MC also has a typical peak sink current of 2.2A, seen on page 12 of the datasheet. This should be sufficient for your customer’s system.

    If you are still curious about what a better driver might be, feel free to share more about your system.

    If this answered your question, could you please press the green button? If not, please feel free to ask more questions.

    Thanks and best regards,

    John

  • 0 in reply to John Geiger
    TI__Genius 12725 points

    Hi John,

    If UCC5310MC limits a sink current current due to actual sink current is over IOL, it will be slow down the turn off time of IGBT. But it will not be happen a device damage. Is my understanding correct?

    Best Regards,
    Fujiwara

  • 0 in reply to Yasushi Fujiwara
    TI__Expert 3355 points

    Hi Fujiwara,

    You are correct, the pull-down current will be clamped to the peak current of UCC5310MC. This will not damage the device, but it might slightly slow down the gate-to-source pull-down time. Since this is very close to the peak current limit of UCC5310MC, and using a 10 Ohm gate resistor, I don't think it would affect your pull-down time very much.

    If you need a faster pull-down time and only need basic/functional isolation, you might also be interested in UCC5350MC. This is a very similar device, with larger pull-up and pull-down structures, allowing a higher peak current.

    If this answered your question, could you please press the green button? If not, please feel free to ask more questions.

    Thanks and best regards,

    John